<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="box">
        <div class="content">
            
        </div>
    </div>
</body>
<style>
    *{
        margin: 0px;
        padding: 0px;
    }
    .box{
        display: flex;
        justify-content: center;
        align-items: center;
        background-color: blue;
        width: 100%;
        height: 600px;
    }
    .content{
        display: flex;
        justify-content: center;
        align-items: center;
        width: 80%;
        height: 70%;
        background-color: bisque;
    }
</style>
</html>